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have to

have to idiom

Also, have got to. Be obliged to, must. For example, We have to go now, or He has got to finish the paper today. The use of have as an auxiliary verb to indicate obligation goes back to the 16th century; the variant using got dates from the mid-1800s.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.